package com.imooc.security.core.validate.code;

import com.imooc.security.core.properties.SecurityProperties;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.ServletRequestUtils;
import org.springframework.web.context.request.ServletWebRequest;

import java.awt.*;
import java.awt.image.BufferedImage;
import java.util.Random;

/**
 * Created by zghgchao 2018/4/21 23:34
 */
//@Component //使用Component可以代替ValidateCodeBean中的配置
//@ConditionalOnMissingBean(name = "imageCodeGenerator")
public class ImageCodeGenerator implements ValidateCodeGenerator {

    @Autowired
    private SecurityProperties securityProperties;

    @Override
    public ImageCode generate(ServletWebRequest request) {
        int width = ServletRequestUtils.getIntParameter(request.getRequest(),"width",securityProperties.getCode().getImage().getWidth());
        int height = ServletRequestUtils.getIntParameter(request.getRequest(),"height",securityProperties.getCode().getImage().getHeight());
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

        Graphics graphics = image.getGraphics();

        Random random = new Random();

        graphics.setColor(getRandColor(200,250));
        graphics.fillRect(0, 0, width, height);
        graphics.setFont(new Font("Times New Roman", Font.ITALIC, 20));
        graphics.setColor(getRandColor(160,200));

        for (int i = 0; i < 155; i++) {
            int x = random.nextInt(width);
            int y = random.nextInt(height);
            int x1 = random.nextInt(12);
            int y1 = random.nextInt(12);
            graphics.drawLine(x, y, x + x1, y + y1);
        }

        String sRand = "";
        for (int i = 0; i < securityProperties.getCode().getImage().getLength(); i++) {
            String rand = String.valueOf(random.nextInt(10));
            sRand += rand;
            graphics.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110)));
            graphics.drawString(rand, 13 * i + 6, 16);
        }

        graphics.dispose();
        return new ImageCode(image,sRand,securityProperties.getCode().getImage().getExpireIn());//过期时间60秒
    }

    /**
     * 生成随机背景条纹
     * @param fc
     * @param bc
     * @return
     */
    private Color getRandColor(int fc,int bc){
        Random random = new Random();
        if (fc > 255){
            fc = 255;
        }
        if (bc > 255){
            bc = 255;
        }
        int r = fc + random.nextInt(bc - fc);
        int g = fc + random.nextInt(bc - fc);
        int b = fc + random.nextInt(bc - fc);

        return new Color(r,g,b);
    }

    public void setSecurityProperties(SecurityProperties securityProperties) {
        this.securityProperties = securityProperties;
    }
}
